In terms of speed, the speed of synchronous motor is synchronous with the electromagnetic speed, and the speed of asynchronous motor is lower than the electromagnetic speed. In the case of no out-of-step problem, no matter the load size, the speed of synchronous motor will not change, the speed of asynchronous motor always changes with the change of load. At present, Yongrong Power Co., LTD. 's stamping technology supports single notching, compound punching and progressive punching. Compound stamping Composite stamping can be used to produce stator laminations and rotor laminations. In terms of stamping, some complex rotor laminations of permanent magnet motor may need stamping twice, while compound stamping can rush out a complete motor lamination only once. By this token, the production rate of compound stamping is very fast, also, it has good flatness and concentricity. Although the cost of the mold is not cheap, when costs allocated to each mot…